Computer Science
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985em%26p...33..133r&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 33, Oct. 1985, p. 133-155.
Computer Science
1
Bedrock, Mineralogy, Petrography, Structural Basins, Finland, Glaciers, Precambrian Period, Sedimentary Rocks, Volcanoes
Scientific paper
The petrology of the Precambrian rocks around the Vaasa circular structure and the development of this area and the structure are discussed. The Vaasa structure is composed of flat cultivated ground with a diameter of 5-6 km and a surrounding bedrock ring rising 50 m above the center of the structure and the sea. The surrounding bedrock is composed of Precambrian mica, quartz-feldspar gneisses, quartz and granodiorites, and porphyritic granites. Glacial deposits, which are similar to the rocks in the center of the Vaasa structure, have been found. The development and location of these bedrock types and glacial boulders are described. The location and composition of dikes and shear zones are examined. Areas of tectonic movement in the circular structure are presented; this supports the theory of depression formation due to tectonic movements causing the development of the Vaasa circular structure.
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